Used to construct C classes (CUnion, CStruct, etc)
Fiddle::Importer#struct and Fiddle::Importer#union wrap this functionality in an easy-to-use manner.
# File tmp/rubies/ruby-2.7.6/ext/fiddle/lib/fiddle/struct.rb, line 51
def create(klass, types, members)
new_class = Class.new(klass){
define_method(:initialize){|addr|
@entity = klass.entity_class.new(addr, types)
@entity.assign_names(members)
}
define_method(:to_ptr){ @entity }
define_method(:to_i){ @entity.to_i }
members.each{|name|
define_method(name){ @entity[name] }
define_method(name + "="){|val| @entity[name] = val }
}
}
size = klass.entity_class.size(types)
new_class.module_eval(<<-EOS, __FILE__, __LINE__+1)
def new_class.size()
#{size}
end
def new_class.malloc()
addr = Fiddle.malloc(#{size})
new(addr)
end
EOS
return new_class
end
Construct a new class given a C:
-
class
klass(CUnion,CStruct, or other that provide an entity_class) -
types(Fiddle::TYPE_INT, Fiddle::TYPE_SIZE_T, etc., see the C types constants) -
corresponding
members
Fiddle::Importer#struct and Fiddle::Importer#union wrap this functionality in an easy-to-use manner.
Example:
require 'fiddle/struct' require 'fiddle/cparser' include Fiddle::CParser types, members = parse_struct_signature(['int i','char c']) MyStruct = Fiddle::CStructBuilder.create(Fiddle::CUnion, types, members) obj = MyStruct.allocate
# File tmp/rubies/ruby-2.7.6/ext/fiddle/lib/fiddle/struct.rb, line 51
def create(klass, types, members)
new_class = Class.new(klass){
define_method(:initialize){|addr|
@entity = klass.entity_class.new(addr, types)
@entity.assign_names(members)
}
define_method(:to_ptr){ @entity }
define_method(:to_i){ @entity.to_i }
members.each{|name|
define_method(name){ @entity[name] }
define_method(name + "="){|val| @entity[name] = val }
}
}
size = klass.entity_class.size(types)
new_class.module_eval(<<-EOS, __FILE__, __LINE__+1)
def new_class.size()
#{size}
end
def new_class.malloc()
addr = Fiddle.malloc(#{size})
new(addr)
end
EOS
return new_class
end
Construct a new class given a C:
-
class
klass(CUnion,CStruct, or other that provide an entity_class) -
types(Fiddle::TYPE_INT, Fiddle::TYPE_SIZE_T, etc., see the C types constants) -
corresponding
members
Fiddle::Importer#struct and Fiddle::Importer#union wrap this functionality in an easy-to-use manner.
Example:
require 'fiddle/struct' require 'fiddle/cparser' include Fiddle::CParser types, members = parse_struct_signature(['int i','char c']) MyStruct = Fiddle::CStructBuilder.create(Fiddle::CUnion, types, members) obj = MyStruct.allocate